bright UNID GSO at 1 deg East from USA 155

From: Sergey Guryanov via Seesat-l <seesat-l_at_satobs.org>
Date: Mon, 18 May 2015 16:30:53 +0300
Could anybody help with this UNID GSO identification?

Very bright UNID GSO (~7.5mag) at 1 deg East from USA 155
(Another side of the Earth ;-))

This bright GSO object was accidentally seen at 20141001 and confirmed at 20141018.
Then there was a lot of work and a long winter, and I thought that soon will be information about it.
But so far it remains unknown(?)..
Was observed again at 20150506, 20150508 and 20150512...
A series of observations to determine it's orbit was made in the following night: May 13, 2015

As result is (SatFIT 3.1):
GSUnid
1 99999U Unknown  15133.68947917 0.00000000  00000-0  50000-4 0    09
2 99999   7.2692  41.1793 0009047 290.3383 258.8789  1.00266873    01

Beidou G3 (36590U) and USA 155 (26635U) are clearly visibles near this UNID at 20150513.

Not the most precise measurements (Canon 1100D, 1s timing and 7.9"/pixel), but this TLE is rather good: 
the week before 20150513 - deviations was within 1' (for observations 20150508) and very close for 20150514...

This UNID is similar to Adwanced Orion/Mentor object, but why it remains unknown during more than half year? 

At october 2014 was about 4 deg west and 2.5 deg above current location.

==
Sincerely, Sergey Guryanov, science teacher from Siberia, Russia
E56.1019   N94.5533    h~154m - for my balcony. 
Canon 1100D + 135mm/3.5 lens (+homemade drive)

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Received on Mon May 18 2015 - 08:31:53 UTC

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